When i check cruise excursions sites i see some adrenalin full excursions day offer. Its looks like things to do once in a lifetime like rock climbing , scuba diving without need of a license , sea plane tour and my favorite ferrari driving in italy country side .
What do you think about these ? Anyone has any experience with these tours ?
Thanks.

As long as you're insured, fit, and can afford it, sounds like a plan to me. Especially, driving the Italian countryside in a Ferrari! I don't know if there is an equivalency of the Better Business Bureau in Europe to check to make sure companies are legitimate, but if there is, I'd make sure they're not fly by night operations. Also, make sure that you schedule your activities with plenty of time to get back to the ship. If you're not on a ship's excursion, they will not hold the ship for you. It is your responsibility to catch back up to the ship.

Sea Plane tour and Ferrari was NCL excursions one for Rome and one for Malta . When i check tour organizers page it looks like fully insured excursions but dont know details .
When we book online from ncl shore excursions site how can we cancel or change our excursions ? Do you know the procedure ? Thanks .

There is a shore excursion desk on board, if you want to cancel or change your prebooked excursions. Usually they require a 24 hour notice for cancellation. I haven't booked on NCL for a while, but I think they do it like other lines. They won't add it to your credit card until you actually take the excursion. I'm sure the tour operators are insured, I meant that you have personal insurance in case of injury. I'm also sure that the Ferrari would require you to take out their insurance on the vehicle. They sound like fantastic tours.